Enemies can now be killed

In this small update there are three main improvements:

1) Enemies can be killed by shooting at them. (Enemy.Health is decreased by Hitpoints of the bullet). The bullets might change in power and range, as Power-ups become available in the future!

2) Bullets explode within Range of the Enemy. Range is a parameter, that might allow future Power-ups.

3) Game Score is displayed on the Top Left, and is animated when an Enemy is Killed. The animation is simply a Larger font size. And the font shrinks to normal size. Multiple kills may increase the Font Size more.

As soon as Enemies become alive (shooting bullets at the Player, or moving towards the player) the game will become a lot more exciting.